His Secret Sex Zones

Cosmo guides you to five pleasure receptors on your man's bod. After tonight, you'll be seared into his memory.

You know how to work his body, but do you know how it works? The key to giving a guy maximum pleasure is using moves that make the most of his biology. "Having a better grasp of your partner's physiology will intensify sex for both of you," says Lana Holstein, MD, author of Your Long Erotic Weekend. "When you understand why he reacts to certain touches and the best way to trigger those responses, you'll be able to give him extreme gratification." Intrigued? So were we, which is why we embarked on more randy research. Read on for our findings...then use your guy's bod to do some lusty lab work of your own.

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Secret Sex Zone 1: Cremaster Muscle

A man's penis isn't the only body part that experiences a rise and fall. "The cremaster, which lines the inside of the scrotum and extends into the groin, controls testicular contractions," explains Barbara Bartlik, MD, a psychiatrist and sex therapist at Weill Cornell Medical College in New York City. "It works kind of like a bungee cord, pulling the testicles upward in response to cold and releasing them when the temperature changes."

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How to master it: This magic muscle also responds to sexual stimulation, causing his boys to contract when he's about to orgasm. "The closer a man is to climaxing, the more his testicles recede," explains Debra Fromer, MD, an assistant attending urologist at Hackensack University Medical Center, in New Jersey. In turn, pulling down on his balls when you're in the midst of passion delays ejaculation, prolonging his pleasure.

So take advantage of Mother Nature — and give your guy the kind of big O that'll make his head spin — by working against gravity and gently tugging on his pals as you're giving him oral (when you have primo access). Start by teasing his inner thighs with your tongue. Then, "take his penis into your mouth, cup the scrotum with one hand and pull it away from his body," says Lou Paget, author of The Great Lover Playbook. "Start off very gently, and ask your partner to let you know how hard he wants you to pull," suggests Paget. "Get into a rhythmic pattern, working your hands in tandem with your mouth movements to virtually double the sensation."

Secret Sex Zone 2: Prostate

You're most likely aware that guys have something called a prostate, but you probably didn't realize it's also a pleasure minefield. This walnut-size gland surrounds the urethra and could be described as the male G-spot. "Its actual function is to create secretions that are part of the fluid in semen," says Dr. Fromer. But when stimulated, this nugget of nerves can pack a powerful erotic punch.

How to master it: You can set off this internal bliss bomb through its neighbor, the corpus cavernosa, which are "two cavities of spongy, erectile tissue in the penis," says Dr. Holstein. Think of them as a couple of cigar-shaped sponges that become engorged with blood (causing an erection) when a man is aroused.

Since the corpus cavernosa is next to the prostate, manually stimulating your man's penis can subsequently stimulate his G-spot. "Wrap your hand around the shaft and move it toward your partner's body rather than performing the usual up-and-down strokes," says Carol Queen, PhD, sexologist at Good Vibrations. "Pushing toward him causes the two pieces of the corpus cavernosa to cuddle the prostate," Queen continues. "It's like giving him a sexy internal massage."

Secret Sex Zone 3: Lips

Sure, smooching is hot, but you might not think of his kisser as one of the most thrill-inducing parts of his body. However, "the mucous membranes that comprise the lips have a dense supply of nerve endings," says Dr. Bartlik. "Plus, the skin here is very thin, so that network of nerves is closer to the surface, making it more responsive to stimulation."

How to master it: Before you plant a big wet one on him, tease him by kissing him everywhere but his lips. Give him kisses all over his face and neck to build anticipation. When he's so fired up that he's compelled to move in for a full-blown lip-lock, amp up the titillation factor by mixing your moves. Lick his lips as if you were lapping an ice cream cone, suck on the tip of his tongue, and graze your lips against his. "As he becomes increasingly aroused, his lips will engorge with blood, making them more sensitive," says Dr. Bartlik.

You'll really send a jolt of erotic electricity through his system if you vary the texture by alternately using the top and underside of your tongue. "The different sensations add newness and surprise, which heighten the excitement," says Paget. Another pucker ploy: "Take his lower lip into your mouth, and with the tip of your tongue, lick the little nook where his lip and chin meet," suggests Paget. "This region is surprisingly sensitive and often overlooked, which makes it that much more pleasurable."

Secret Sex Zone 4: Nipples

In the past, Cosmo's clued you in to the frisky fact that men's headlights are crammed with pleasure-receptive nerve endings, but some of you still might not be giving them the attention they deserve. Remember, it's how you work them that really matters. "When stimulated correctly, these erogenous zones transmit feel-good sensations to the brain in the same way the genitals do," says Dr. Bartlik.

How to master it: To make his nipples — and the rest of him — quiver, play with them while you're having girl-on-top nooky. Start off coyly and allow the anticipation to grow by trailing your index finger along his chest, making gentle circles around, but not quite touching, his nips. Then run your hand down his rib cage on one side, across his lower abs where his pubic hair begins, and up the other side. Return to his now supererect headlights and make circles again. Only this time let your finger zero in on the bull's-eye. "Lightly dance around his nipples and the areolae with your fingertip to draw out the excitement," says Queen.

Treat him to even more pulse-pounding sensations by getting your mouth in on the action. "Substitute the tip of your tongue for your finger," says Paget. "Start licking the outline of the nipples and gradually work your way in, making smaller and smaller circles." You can up the erotic ante by periodically sucking, and even nibbling, on his erect nipples. "Hold it between your lips and suck, bite lightly, then gently swirl your tongue around it and give it a kiss," says Queen. "Periodically, pull away and just graze the area with your hair or your lips, letting your hot breath linger on one nipple, then the other." After turning him on to this trick, he'll really be a boob man.

Secret Sex Zone 5: Perineum

By now you've heard of the perineum, the patch of skin that lies between his family jewels and anus and is endowed with orgasmic potential. "The perineum is rich with nerve endings that, when stimulated in the right way, can produce satisfying sensations," says Paget.

How to master it: What you may not realize is, the best way to access this neural nub is in missionary position, where you can easily reach between his legs. When he seems to be nearing the finish line, gently press into this spot with the knuckle of your index finger. "This is such a highly sensitive area, it's best to use your knuckle so you don't accidentally scratch him," explains Paget.

To knead him into orgasmic oblivion, mix up the direction and amount of pressure. "When you touch one area repetitively, the nerve endings become exhausted and no longer sense pleasure," says Dr. Holstein. So first go in clockwise circles, then switch to counterclockwise, then massage up and down, and so forth. Keeping him on edge by switching moves will have his entire neural network on high. When he's ready to blow, press this bundle of feel-good receptors a little harder to give him the ultimate O.